Adjustable toolholder



Feb. 28, E950 F. A. MAXWELL 2,499,151

ADJUSTABLE TOOLHGLDER Filed Jan. 30, 1947 .INVENTOR. FR'D A. MAXWLL A TTOENE Y5 Patented F eb. 28, 1950.

ADJUSTABLE TOQLHOLDER Fred A. Maxwell; Bedford, Ohio, tassignor Lto'Jaok Erwin Maxwell, Redford, Ohio Application January 30, 1947, smamo. *rz'szios (o1. are-e d Claims.

1 This invention relates to improvementiin'tool holders of the type that are-employedforthe support of boring bars and instruments ofthe type that are designed for operative adjustment in eccentric relation to the axis of rotation of the holder.

.One of the objects of theinvention is to prowide mechanisms 'forradial adjustment of a'tool, which is sensitive of operation and capable "50f resisting the thrust and vibratoryreactions imgposed thereon during the operation of the tool.

Another object of the invention is to provide graduations ona .tool holder which are arranged to accommodate adjustment thereof respective to the position of the tool when the-holdercomes 'torest,

vAnother object of the inventionlis to provide a holder which is designed to facilitatelthe rigid :support of the tool and liberal radial adjustment thereof.

another object of the invention is to provide a holder which will accommodate the support of s-thetool in parallel relation to the axis of rotation of the holder or at right angles thereto.

Further objects of the invention residein the provision of a holder which ,is sturdy of structure *and efiicient and facile of operation.

Other objects and advantages more or lessan- ,cillary .to the foregoing and the mannerin which all the various objects are realized Will appear in the following description, which, consideredin connection with the accompanyingdrawings,sets =Io,rth the preferred embodiment of the invention.

Referring to the drawings,

.Figrl is a side view ofatoolholder' in accord ance with the invention;

' ..F,'ig..2 is ,a longitudinal section "taken on a plane 'zindicated'by the line 2='2 in Fig. 1

,Fig. 3 is a view ofthe scroll face of the adjusting collar; t, Fig. 4"is a view of the underside 'of the :too

" block 5 is a 'plan view of the trace of the tool holder illustrating the'mounting of a tool par :allel'tothe axis of the holder; and

Fig. 6 is a side viewofthe body 'ofitheholder. The principal parts of the adjustable tool holder area 'body "i 0, a tool block 30,-an adjusting *collar 5il,'and a retainer 10. The body is adapted ffor'mounting onthe rotating spindle :of a ma "chine tool, and the toolblock is'mounted on the bodyfor reciprocation transversely of the spin- "rdle axis. Adjustment of the position, of the'tool 'lblock is effected by the collar 50 and the riarts are retainedun operative relation by'the -rin'g10:

12 While the tool ho'l'der will be described as adapted formounting on a rotating spindle, it may, :Of courseybe held stationary when employed in =ma chine tools in which the work isrotated.

'The body to comprises a cylindrical portion H havingan axial "bore 42' therein for the reception of thearbor or drivingshank of the tool.

The outer end of the cylindrical portion H is formedwithan enlarged head which is undercut -to define a-depending flange 6' and annular recess 11 -'(Figs. 2 and '6) intermediate the flange "and' body. A diametral dovetail groove 18 is machinedin the head I'4,=-the face 'of thehead adjacent "the groove being formedw'ith -sl-ightly elevated ledges -19 which are finished to provide abearing for the'tool' block 30.

' The tool block (Figs. 1, 2, 4-and'5) is generally -of'-'arectangular form "having the endpo-r'tions "31 thereof rounded to conform to the circum- 20 ference of "theh'ead M. The base of "the-block is formedwith 'a longitudinal dovetail tenon P32 machined 'forsliding engagement with the "slot I8 and upon the ledges l9 of the body. 1onigitudinal boretd'disposed in normal relation to *the'axis of rotation of the tool holder isprovided (in the l tool block for the reception of a cutting tool i101 which'is retained 'by setscrews 36 and 31. Additional hol'es '38 and 39 (Figs. '2 and ,5) ,bored parallelto the axis of rotation 'of the tool are provided "for the support-of 'a "boring bar, such as the tool I43 (Rig. *5). The holes 38 and "39 are arranged so "that either of the set screws '36 and 31, may be. used to "lock; the tool. in-place.

"The hole "38 is preferably drilled adjacent the center of the block '30 while the hole '39 is near one end-thereof. The toolblock is formed with a, longitudinal rib 4| dependin from the lower face of {the tenonuslwhich is "machined with spiral cutteethl-Z to cooperate with a scro1l5l (Figs. "2 and 8) on the end of the adjusting collar 50. A groove 2|, milled in the bottom of the dovetail guideway l8 affords clearance forthe rib 4| andteeth t2 thereon. l

jThe co11ar50 is machined with an axial bore 52 which is journaled for free rotative movement upon'thebody H. The collar isifurther formed with areduced end portion 53 which is enveloped by the annular flange It. The shouldered face 5-4 of'the collar is disposed 'in abuttingengagem'ent with the end wall "22 of the flange Iii-fin order to provide clearance between 'the crest of 'ithe teethyof the scroll 5i andv the inner wall of the annular recess I]. The teeth of the scroll 5|,rwhich "is in the formof an Archimeclean gspiral,-are "engaged with the spiral "teeth *42 of the took block. The teeth 42 may be provided on both ends of the tool block as shown in Fig. 4, to secure full diametric engagement with the scroll or may be provided on one end of the tool block with, however, some sacrifice of strength.

The pitch of the scroll is preferably onetenth of an inch, so that one turn of the collar 50 will advance the cutting tool one hundred thousandths of an inch. The collar is provided with graduations 56 dividing its periphery into 100 equal portions, and the flange I6 is provided with ten equally spaced index marks 24. The 1 provision of a plurality of index marks on. the. body facilitates the ready adjustment of the tool" irrespective the position at which "it co'mes torest 5 since the collar may be turned the necessary amount to advance the tool the desired number of thousandths of an inch by moving the scale 56 with reference to any one of the visible marks 24. For convenience in rotating the collar, a

portion of the outer surface thereof may ,be

formed with flutes or serrations 51 and holes'58 may be drilled therein forthe application of a spanner wrench.

' The collar 56 is retained upon the body in slig ht, 5

frictional engagement with the tool block by a threaded ring Ill which is formed with a plane "inner face ii that, engages the end of the collar pingement with the ring and adapted to pro:

when brought into impinged relation with a shoulder 26 adjacent the threaded end 2! "of the: body, for engagement with a threaded shank.

; The lower face of the ring is provided with holes 12 disposed to accommodate the application of a pin wrench or similar tool. With the ring jammed against the shoulder 26, the collar 50 is; free to rotate but is held against axial movement of the collar. The inner end of the collar is formed with a plurality of holes 6| for the reception of springs 59 which are disposed for imvide sufficient frictional resistance to prevent rotation of the collar after adustment and particularly during operation of the tool. I

The tool block 30 may be clamped bya screw engaged with a pin 28 (Fig. 2) having a beveled end thereon which is machined for engagement with the side face of the tenon32 of the block.

. The screw 20 is mounted in a tapped radial hole in head [4 of the body of the tool holder.

The preferred form of shank or arbor for the tool holder comprises a unitary member 9!] formed l. with a tapered end portion 9| machined for en- .gagement with the bore l2 of .the body [0 and a shank 92 proportioned to fit the usual taper socket .in a machine tool. A Woodruif key 93 is provided to prevent rotation .of the body relative to the j shank.

It is believed that the mode of use of the tool i holder will be apparent to those skilled in the art from the description herein of its structure.

The term-torque-exerting part of a machine tool is employed in the claims as genericto the spindles of boring machines and thelike; and the .tool posts, tail stocks, and turretsof lathes and,

in general, to structures of machine tools in which tools are mounted for movement relative to a work piece being machined and which receive the .reaction due to the cutting force. is adopted because I know of no generic term for This phrase these equivalent structures with any or which the tool holder may be used.

Although the foregoing description is-neces- @sarily, ofa detailed character, in order that the invention may be completely set forth, itis tobe i u r oo ha the pec c. i m ql y 1. 1mi.

intended to be restrictive or confining, and that various rearrangements of parts and modifications of detail may be resorted to without departing from the scope or spirit of the invention as herein claimed.

I claim:

1. An adjustable tool holder comprising a cylindrical body with a flange at one end, the flange being formed with a substantially diametral way,

10 atool block'slidable in the way,'an adjusting collar rotatable on the body and formed with a scroll on one end, the tool block having a portion engaging the scroll for adjustment of the position of thetool block, a removable flange on the body retaining the collar thereon, and means for providingfriction between the collar and the removable flange.

2. Anadjustable tool holder comprising a head adapted for mounting on a machine tool spindle, 20 the head being formed with an annular body,

. and a face of larger diameter than the body at one i end thereof and perpendicular to the axis thereof,

, the face being. formed with a transverse dovetail slot; a tool block engaging the face and formed with a dovetail tenon engaged in the slot "for reciprocation therein; a collar rotatable on 'the head adjacent the face portion, the face of'the collar being formedwith a scroll thereon; teetn on the tenon engaging the scroll whereby rotation of the collar onthe head'causes reciprocation of the tool block; a retainerremovably mounted on the end of the body opposite the face end for maintaining the scroll in engagement with the teeth; and resilient members compressed between the collar and retainer for frictionally opposing rotation of the collar. I

3. An adjustable tool holder comprising ahead adapted for. mounting on a machine tool spindle, the head being formed with a cylindrical body, a face of larger diameter than and perpendicul'ar'to the body at one end thereof, and a flange on the face extending in the direction of the body, the face being formed with a transverse dovetail slot; a tool block engaging the face and formed with a dovetail tenon engaged in the'slot for reciprocation therein; a collar rotatable on i the body and having a portion within the flange,

the end of the collar being formed with'a scroll thereon; teeth on the tenon'engaging the-scroll 0 whereby rotation of the collar on the bodycauses reciprocation, of the .tool block; a retainer-removably mounted on the end of the body opposite the face end for maintaining the scroll in engagement with the teeth; and resilient members received in the collar and compressed between the collar and retainer for frictionally opposing rota- .tion of the collar.

' 4. An adjustable tool holder comprising an annular body formed with a flange on one end and 30 a shoulder on the other end, and formed with a a way extending across the face of the-flanged end thereof, a tool block slidable in the way,,a' collar coaxial with the body and rotatable thereon abutting the flange, a scroll on the collar; teeth on the tool block engaging the scroll, anda-retainer on the body lodged against the shoulder and abutting the'collar. j

. 5. An adustable tool holder comprising, ..-an

annular body formed with a flange on one'en d'and a shoulder on the other end, and formed with a way extending across the face of the flanged end thereof, a tool block slidable in the way, a collar coaxial with the body and. rotatable thereon abutting the flange, a scroll on the collar, teethon the 7 5 tool block engaging the scroll, a retainerbn' the 2,499, l 5 1 a s a 6 body lodged against the shoulder and abutting the REFERENCES CITED collar, and means for providing frictional resist- 1 c ance between the shoulder and collar to oppose TAB Ionowmg refelences ale OI record m the rotation of the collar. file of patent:

6. An adjustable tool holder comprising an 5 UNITED STATES PATENTS annular body formed for mounting on a torqueexerting part of a machine tool and provided with fi fi g g a substantially diametral way, a tool block non- 1373856 Bosch 1921 rotatably mounted in the Way and slidable in the 1463686 may 1923 Way, and an adjusting collar journalled on the 10 23O5737 Richards 1942 body, extending around the periphery of the body, and freely rotatable on the body and formed with OTHER REFERENCES a scroll on one end, the tool block having a por- American Machinist December 17, 1914 tion engaging the scroll for adjustment of the position of the tool block longitudinally of the 15 Way.

FRED A. MAXWELL. 

